Have you tried LSPHP (LSAPI + PHP) which is much better than FCGI+PHP+FPM?

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Well, it is not better in my situation:
-running on low volume and -std, performance does not matter much (and do you have benches LSAPI vs FCGI+PHP+FPM?)
-having to compile a new LSAPI module each time there is a PHP upgrade is a PITA
And I did not have this issue with previous versions of Litespeed even using FCGI.
thanks for your help!

No pending :80, but I just changed the main binding from [ANY] IPV6 to ANY. And so far so good! Let's try to change it back and see.. Nope, still fine. I am at loss to explain what caused it, fingers crossed